| 摘要 |
PURPOSE:To obtain a sensitive and stabilized detector, by placing a pressure- sensitive rubber band between first and second band-shaped electrodes and covering with a deformable covering member. CONSTITUTION:A case 4 composed of end (a), side (b) and edge (c) portions is of a recessed cross section, thicknesses of edge (c) and side (b) portions are mode thinner than the thickness of the end portion (a). Now, pressure applied to the case 4 is transmitted to a pressure sensitive rubber piece 1 through an electrode 3 by buckling of the case 4 itself and the piece 1 receives pressure as squeezed between electrodes 2, 3. The band-shape rubber piece 1 is, when pressure is zero, provided with almost infinite resistance value, however, even if its area is limited, when pressure exceeds the specified value, then the resistance value changes to an extremely small one, for example, a few OMEGA/cm<2>. An electic current applied between the electrodes 2, 3 allows a current to flow between the electrodes 2, 3 which is detected with an electric circuit for its magnitude. Thus, it is possible to tell whether pressure was applied to the pressure-sensitive rubber piece 1. |
